Highway driving my guess would be negligable and def more affected by rolling resistance. Stop and go it might be noticable. FWIW with just over 5k on the clock i have no trouble seeing the diff in f-r wear. Its tough to make a call at this point but 25-30k seems about right if not pushing it- i don't drive on baldellis. But i guess with more weight and twist i should expect less treadlife than a comparable 2L CX5.